sandflee created YARN-4050:
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Summary: NM event dispatcher may blocked by LogAggregationService
if NameNode is slow
Key: YARN-4050
URL: https://issues.apache.org/jira/browse/YARN-4050
Project: Hadoop YARN
Issue Type: Bug
Reporter: sandflee
env: nm restart and log aggregation is enabled.
NN is almost dead, when we restart NM, NM event dispatcher is blocked until NN
returns to normal.It seems. NM recovered app and send APPLICATION_START event
to log aggregation service, it will check log dir permission in HDFS(BLOCKED)
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